Clock-pendulum.



No. 703,020. Patented June 24, I902.

' D. W. THOMPSON CLOCK PENDULUM.

(Application filed Sept. 30, 1901) (No Model.)

UNITED STATES PATENT OFFICE.

DAVID IV. THOMPSON, OF CHICAGO, ILLINOIS.

CLOCK PENDULUM.

SPECIFICATION forming part of Letters Patent No. 703,020, dated June24:, 1902.

Application filed September 30, 1901. $erial No. 77,049. (No model.)

To all whom it may concern:

Be it known that 1, DAVID W. THOMPSON, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Olock-Pendulums, ofwhich the following is a specification.

One of the objects of this invention is to improve the means forsuspending a clockpendulum.

A further object of the invention is to produce a pendulum whose axes ofsuspension and vibration are in the same plane.

A further object of the invention is to provide a firm, strong, yetalmost frictionless bearing support for pendulums of large clocks, sucha support as will resist shocks and strains withoutinjury orniisadjustment.

In the accompanying drawings, Figure 1 is a vertical central sectionthrough the supporting-bearings of a clockpendulum embodying thefeatures of my invention. Fig. 2 is a horizontal central section throughthe supporting-bearings of this pendulum, the suspending-block for thependulum being shown in elevation. Fig. 3 shows in side elevation myimproved pendulum-suspending device; and Fig. 4 illustrates saiddevicein a sectional view taken on dotted line 4 4 of Fig. 1, thependulum being shown in position.

Like letters of reference indicate corresponding parts throughout theseveral views.

In the production of this improved pendulum-suspending device I providea yoke A, having a cylindrical integral stem A, adapt ed to enter asuitable opening in the clockframework a to hold the yoke in position.Two alined openings A and A are provided in the yoke A, both of whichopenings are internally screw-threaded and each of which is intersectedby one of the two internallyscrew-threaded openings A extendingsubstantially at right angles with said openings A and A B is aheadlessmachine-screw adapted to be turned into the opening A and B is a similarscrewadapted to enter the opening A. Each of the screws B and B isslotted at its outer end to receive a screw-driver and on its inner endis provided with the pocket B having a raceway B adapted to receive theantifriction balls B". To hold. these balls in place, I provide theball-retainer of annular form and adapted to be set within the outer endof the pocket B O represents locking-screws adapted to enter thescrew-threaded openings A, their purpose being to prevent themachine-screws B and B from accidental displacement.

D represents the pendulum supporting block, having theoppositely-extending c011- ical trunnions D, intended to enter thepockets B of the screws B and B and there to bear upon the antifriction-balls B The blockD is substantially rectangular in form and is providedwith the cylindrical integral studs D projecting from the sides of saidblock at right angles to an axial line passing through the conicaltrunnions, the axial line of the cylindrical studs D lying in the sameplane as that of the conical trunnions D.

E represents a pendulum-rod of common construction, split at itsupperend to receive the web E at the base of the metallicsupporting-arms E These arms are formed integral with the web E and aretwisted so that their faces extend at right angles therewith. The upperends of the arms E are rounded off and are provided with the alinedopenings E adapted to fit over the cylindrical studs D of thependulum-supporting block D.

E" is the usual opening in the pendulumrod for receiving the vibratingwire from the pallet of the escapement of the clock mechanism. The web Eis secured within the opening at the upper end of the pendulum by therivets E extending through said web and said pendulum-rod.

In practice the yoke A is attached in any suitable manner to theclock-frame, as by inserting the stem A within asuitable opening in saidframe. Great care is not required in the mounting of the yoke, as thependulum swinging upon its axis of suspension-to wit, the cylindricalstuds D -will swing in a per pendicular plane upon its axis of vibrationto wit, the conical trunnions D. A proper adjustment of thetrunnion-bearings is made by turning up the screws 13 and B until thebearing is tight and then unscrewing one of said screws until an easymovement of the pendulum is obtained. The screws 13 and 13 are held intheir proper position. by the locking-screws C. The ball-retainer B inthe outer end of the pocket 13 in each of the screws B and B holds theballs within their raceway and permits the removal of said screwswithout displacing the balls.

In clocks having the ordinary form of pendulum it is necessary that thependulum be suspended from an axis exactly horizontal. WVith my improvedmeans of suspension this is not at all necessary, as the pendulum willalways seek the perpendicular whether or not its axis of oscillation isexactly horizontal. Looseness of the joint between the arms E of thependulum-rod E and the cylindrical studs D of the supporting-block D mayoccur without causing inaccuracyin the movement of the pendulnm,for thereason that the axis of suspension and the axis of vibration are both inthe same plane.

I claim as my invention 1. In aclock-pendulum, in combination, asupporting-block having oppositely-extending trunnions upon which saidblock is intended to oscillate; bearings for said trunnions; studsextending from opposite sides of said supporting-block and at rightangles with said trunnions, the central axis of said studs being in thesame plane with the oscillatory axis of said supporting-block; and apendulum-rod pivotally suspended upon said studs.

2. In a clock-pendulum, in combination, a supportingblock having conicalbearingtrunnions projecting from opposite sides thereof; a bearing forsaid trunnions; studs projecting from opposite sides of saidsupporting-block at right angles to the axial line of said trunnions;and a pendulum-rod pivotally suspended upon said studs, the axis ofsuspension of said pendulum-rod being on the same plane with its axis ofvibration.

3. Ina clock-pendulum, in combination, a yoke; a supporting-blockpivotally mounted in said yoke; and a pendulum-rod pivotally connectedwith said supporting-block, the

oscillatory axis of the block and that of its pivotal connection withthe pendulum-rod being in the same plane.

l. In a clock-pendulum, in combination, a yoke having alined bearingstherein; a supporting-block mounted to oscillate upon said bearings; apendulum-rod pivotallyconnected with said supporting-block, theoscillatory axis of the block and the axis of the pivotal connectionbetween the block and the pendulum-rod being in the same plane; andmeans for securing the yoke in position with relation to a clockmechanism.

5. In a clock-pendulum, in combination, a yoke; two alined bearings insaid yoke; a supporting-block having oppositely-extending conicalirunnions adapted to lie within. the bearings in said yoke, said blockalso being provided with studs extending from opposite sides thereof andat right angles to said trunnions; and a pendulum-rod having perforatedarms adapted to engage said studs, the axial center of said studs beingin the same plane with the axial center of said trunnions.

(3. In a clock-pendulum, in combination, a yoke; twooppositely-extending alined bearing-screws in said yoke; asupporting-block adapted to oscillate between the ends of saidbearing-screws; and a pendulum-rod having a pivotal connection with saidsupporting block.

7. In a clock-pendulum, in combination, a yoke having twooppositely-extending cupbearing screws provided with ball-bearings; abearing-block having oppositely-extending trunnions adapted to liewithin said ballbearings; two studs projecting from opposite sides ofsaid supporting-block at right angles to an axial line extending throughsaid trunnious; and a pendulum-rod having perforated arms adapted toengage said studs.

DAVID IV. THOMPSON.

Witnesses:

L. L. MILLER, Gno. L. CHINDAHL.

